Keyboard problems

[Thrice]

I've been having some responsiveness problems with my keyboard while playing rico. A strafe button will freeze unexpectedly while im playing, or I will begin tap a directional key once and continue to move in that direction without holding down the key. Basically I can't play rico unless I can resolve the problem so im looking for some advice. It started a few days ago for no apparent reason... although I did encounter this problem off and on about a year ago (it was never this bad). I don't see how it can be a problem due to the keyboard alone since I'm able to type perfectly fine when I'm having this difficulty. Any ideas or input would be greatly appreciated.

-- Thrice